Optimize ElastiCache Cluster costs by right sizing cluster node sizes. For different usage scenarios (heavy, moderate, low) their are optimal instances types. Choosing the right type for the right usage scenario saves money.

Amazon Auto Scaling can save costs by better matching demand and capacity. Certainly not a new idea but the diagrams, different leakage scenarios (daily spike, weekly fluctuation, seasonal spike), and the explanation of potential savings (substantial) are well done.

Use Amazon S3 Object Expiration feature to delete old backups, logs, documents, digital media, etc. A leakage of ~20 TB adds up to a tidy ~1650 USD a year.